Accepting dialling with '+' instead of '00'

My Asterisk does not accept dialling strings with e.g. +44xxxx. If I dial with 0044xxxx it’s ok. So my question is how I can intercept calls with +44xxx and replace that to 0044xxxx? I can see that the phone sends me the request via sip debug, but disconnects me before any action can be set.

Thx for your help in advance!

Did you tyr _+XXXX. ?